本文關(guān)鍵詞： 液態(tài)介質(zhì) 鉆探機(jī)具 硬質(zhì)合金 摩擦學(xué) 有限元分析　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本論文著眼于研究鉆探材料在液態(tài)介質(zhì)下的摩擦磨損行為,研制專門針對(duì)鉆探材料摩擦學(xué)測(cè)試的試驗(yàn)機(jī)附屬裝置,使其能夠滿足實(shí)際液態(tài)工況測(cè)試條件;研究了鉆探材料在不同液態(tài)介質(zhì)及載荷下的摩擦學(xué)特性,系統(tǒng)研究了硬質(zhì)合金材料在不同摩擦因素下的摩擦因數(shù)、磨損率、表面粗糙度和表面磨損形貌,分析了不同摩擦因素對(duì)材料的影響;并進(jìn)一步探究了硬質(zhì)合金球面靜接觸的行為分析。結(jié)果表明:(1)設(shè)計(jì)的試驗(yàn)機(jī)附屬測(cè)試機(jī)構(gòu),能夠滿足鉆探材料的液態(tài)工況測(cè)試要求。主要包括上蓋、套筒和工作臺(tái)三部分,加裝附屬測(cè)試機(jī)構(gòu)后可滿足鉆探活動(dòng)零部件在干態(tài)、水態(tài)及水基泥漿等液態(tài)工況下的摩擦學(xué)性能測(cè)試。采用ANSYS軟件分析了主體部分工作臺(tái)的結(jié)構(gòu)強(qiáng)度,并對(duì)工作臺(tái)結(jié)構(gòu)進(jìn)行了優(yōu)化設(shè)計(jì)。結(jié)果表明,在靜載荷作用下的工作臺(tái)應(yīng)力及應(yīng)變?cè)诤侠矸秶鷥?nèi),優(yōu)化后的工作臺(tái)體積在安全邊界內(nèi)最小,滿足機(jī)構(gòu)設(shè)計(jì)要求,能夠保障試驗(yàn)機(jī)運(yùn)行的安全性。(2)鉆探硬質(zhì)合金材料在不同的潤(rùn)滑介質(zhì)及不同載荷下的測(cè)試表明,在干摩擦和水潤(rùn)滑下的平均摩擦因數(shù)分別為0.3和0.2,水基泥漿潤(rùn)滑下的摩擦因數(shù)為0.15,干摩擦和水潤(rùn)滑下的摩擦因數(shù)遠(yuǎn)高于水基泥漿,且水基泥漿下的磨損率和粗糙度都小于干摩擦和水潤(rùn)滑,可見(jiàn)水基泥漿具有良好的潤(rùn)滑特性;硬質(zhì)合金材料在水基泥漿狀態(tài)下,載荷為10 N時(shí)摩擦因數(shù)為0.12,15 N時(shí)為0.15,20 N時(shí)為0.18,可見(jiàn)在水基泥漿狀態(tài)下,載荷對(duì)材料的摩擦磨損行為影響不大;在干摩擦下,硬質(zhì)合金的磨損主要為磨粒磨損和疲勞磨損,且以疲勞磨損為主。在水潤(rùn)滑狀態(tài)下,試樣的磨損主要是腐蝕磨損,在水基泥漿狀態(tài)下,以邊界潤(rùn)滑為主,同時(shí)存在一定的磨粒磨損。(3)基于赫茲接觸理論,對(duì)硬質(zhì)合金球面靜接觸進(jìn)行有限元分析。在相同載荷作用下,當(dāng)摩擦因數(shù)不同時(shí),對(duì)球面最大接觸應(yīng)力和接觸斑半徑的影響很小;當(dāng)摩擦因數(shù)相同而載荷不同時(shí),球面接觸間的接觸應(yīng)力和半徑隨載荷增大逐步增大。將ANSYS分析結(jié)果與Hertz理論計(jì)算進(jìn)行對(duì)比可以看出,二者存在一定的誤差,但ANSYS分析更準(zhǔn)確可靠。
[Abstract]:In this paper, the friction and wear behavior of drilling material in liquid medium is studied, and the accessory device of testing machine for tribological test of drilling material is developed, which can satisfy the actual testing condition of liquid state. The tribological characteristics of drilling materials under different liquid medium and load were studied. The friction coefficient, wear rate, surface roughness and surface wear morphology of cemented carbide materials under different friction factors were systematically studied. The influence of different friction factors on the material is analyzed. Furthermore, the behavior analysis of static contact of cemented carbide spherical surface is studied. The results show that the testing mechanism of the testing machine designed by 1: 1) can meet the testing requirements of drilling materials under liquid condition, mainly including the upper cover. The three parts of sleeve and workbench can be used to meet the dry-state of drilling movable parts after the installation of subsidiary testing mechanism. The tribological properties of the worktable under liquid conditions such as water state and water-based slurry are tested. The structural strength of the main worktable is analyzed by ANSYS software and the structure of the worktable is optimized. The results show that the structure of the worktable is optimized. Under static load, the stress and strain of the worktable are within a reasonable range, and the optimized worktable volume is minimized within the security boundary, which meets the design requirements of the mechanism. The test results of drilling cemented carbide materials under different lubricating medium and different loads show that. The average friction coefficient under dry friction and water lubrication is 0.3 and 0.2 respectively, and the friction coefficient under water based slurry is 0.15. The friction coefficient of dry friction and water lubrication is much higher than that of water based mud. The wear rate and roughness of water-based mud are lower than that of dry friction and water lubrication. When the load is 10 N, the friction coefficient of cemented carbide material is 0.12 ~ (15) N and 0.15 ~ (20) N is 0.18, which can be seen in the state of water-based mud. The load has little effect on the friction and wear behavior of the material. Under dry friction, the wear of cemented carbide is mainly abrasive wear and fatigue wear, and fatigue wear. Based on Hertz contact theory, the static contact of cemented carbide spherical surface is analyzed by finite element method. Under the same load, the friction coefficient is different. It has little effect on the maximum contact stress and contact spot radius of spherical surface. When the friction coefficient is the same and the load is different, the contact stress and radius of spherical contact increase gradually with the increase of load. The results of ANSYS analysis are compared with that of Hertz theory. However, ANSYS analysis is more accurate and reliable.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P634.4

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